Preheat oven to 375°F. Brush a 10-inch pie dish with some melted butter. In a large skillet heat olive oil over medium high heat. Sauté the onions until soft, about 5 minutes. Add the garlic, chile, cinnamon stick, curry powder, ginger, lemon zest and chicken and sauté for 2 minutes. Stir in the prunes, olives, stock, lemon juice, salt and pepper. Bring to a boil. Reduce heat to low, cover and simmer, without stirring, for 10 minutes.

Remove lid and simmer for a further 5 minutes, or until liquid has evaporated. Let cool completely. Meanwhile, pulse icing sugar, cinnamon and almonds in food processor until coarsely chopped. On a work surface, arrange a sheet of phyllo. (Keep remaining phyllo under damp tea towel.) Brush phyllo with butter. Lay in the middle of pie dish allowing excess phyllo to hang over edge. Repeat with 4 more sheets of phyllo. Stir beaten egg and coriander into chicken mixture. Spoon chicken mixture into prepared pie dish. Fold the phyllo pieces that are hanging over the edge of the pie dish, one at a time into middle of pie, sprinkling some of the almond mixture between each layer. Butter 1 piece of phyllo and sprinkle with some of the almond mixture. Place over filling and tuck in any overhang. Repeat with remaining phyllo and almond mixture. (Do these one by one, not stacked together, to achieve a light, blossomy top.) Bake for 20 minutes until top is browned and crisp. Let stand for 5 minutes before cutting into wedges.